INSTRUCTIONS VCH-x20x-DI 67643 06/16 - (KPA)

Modbus cable connection (VCH-6201-DI) Use the four screw terminals to connect the Modbus cable from the OJ-DV. Note, that the connection to the OJ-DV uses the slave port. Please see the OJ-DV instruction. The connection to the OJ-DV provides the 24 VDC power supply, see figure 4.

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English LIST OF FIGURES The following figures are located at the back of the instructions: Fig. 1: Menu scheme Fig. 2: Dimensioned drawing Fig. 3: Position of measurement tube in relation to bends and branches Fig. 4: Wiring diagram Fig. 5: Example of application Fig. 6: Orientation of VCH INTRODUCTION VCH-6201-DI and VCH-3202-DI is electronic pressure/air controller with integrated regulator output, and is primarily used to control ventilation systems, eg. roof ventilators using either constant pressure or constant flow. VCH6201-DI is designed for controlling motor drives (OJ-DV) with Modbus interface, and VCH-3202DI is designed for controlling fans with analog interface. Both types uses a semiconductor pressure element with no air throughput, thus protecting the unit from dust in the ventilation system. The pressure element is temperature compensated to provide accurate pressure measurement throughout the specified temperature range. See ‘Technical Data’. INSTALLATION VCH-x20x-DI should be attached to a firm, level surface using two screws. The pressure controller also functions with only one tube fitted to the tube connectors (+ or -). However, two tubes should always be fitted to maintain the enclosure rating. Pressure is supplied to the measurement unit by tubes, the higher pressure being connected to the ‘+ tube connector’ and the lower pressure to the ‘÷ tube connector’ (see fig. 4). The pressure tubes must be as short as possible and must be secured in position to prevent vibration. To obtain the best possible results, pressure must be measured where there is least risk of turbulence, i.e. in the centre of the ventilation duct and at a distance of at least twice the width of the duct from bends and six times the width from branches (see fig. 3). The housing is opened without the use of tools by pressing the snap lock beside the tube connectors.

Analog cable connection (VCH-3202-DI) The output from the VCH is either voltage or current controlled. The VCH must be provided with a 24 VAC/DC power supply, see figure 4. Setup menu Use the buttons 5 , 6 and OK to navigate the menu. The buttons can be found on the backside off the lid. The menu is divided into three parts - Setup [ Set ], Regulator [ Reg ] and Calibration [ CAL ]. Follow the menu scheme in figure 1 from the bottom up. Note some settings may be hidden depending on other selections. Setup - Pressure or flow mode [ ] Use Setup menu 1 to choose between Pressure or Flow mode. Setup - Pressure range [ ] Use Setup menu 2 to enter the pressure range. Set the Pressure range to match the system pressure working range. Setup - Pressure setpoint [ ] Use Setup menu 3 to enter the pressure setpoint. Minimum is 0 Pa and maximum is 2500 Pa. Setting the minimum setpoint to 0 will halt the ventilation. Setup - k-factor [ ] Use Setup menu 4 to enter the K-factor. Minimum k-factor is 0.001 and maximum k-factor is 9999. Please see the conversion table on page 7 for help to calculate the k-factor. The dot position shall be set before entering the value. Setup - Flow range [ ] Use Setup menu 5 to enter the flow range. Set the Flow range to match the system flow working range. Setup - Flow setpoint [ ] Use Setup menu 6 to enter the air flow setpoint. The scale is 0.000 to 9999. The dot position shall be set before entering the value. The selected dot position will also apply to the display, when showing the current flow. Setting the setpoint to 0 will halt the ventilation. Setup - Damping [ ] Use Setup menu 7 to enter the damping. Minimum damping is 1 seconds and maximum damping is 30 seconds. A low damping can result in unsteady readings, while a higher damping gives a more steady reading but also a slower response time for the regulation. Setup - Analog output type [ ] VCH-3202-DI Only: Use Setup menu 8 to enter the analog output mode. It is possible to switch between 0 - 10 VDC, 0 - 20 mA, 2 - 10 VDC and 4 - 20 mA as regulator output. Regulator menu The VCH-x20x-DI default PI values will fit most systems. Only change the values if it is required or for optimization needs.

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Regulator - Integrator time [ ] Use Regulator menu 1 to set the integrator time. Minimum integrator time is 1 second and maximum integrator time is 9999 seconds. A low value can make the system unstable and a high value can give a slow regulator response. Regulator - Proportional band [ ] Use Regulator menu 2 to set the proportional band. Minimum proportional band is 10% and maximum proportional band is 100% of the Pressure/Flow range. A low value can make the system unstable and a high value can give a slow regulator response. Regulator - Dead band [ ] Use Regulator menu 3 to set the dead band. Minimum dead band is 1% and maximum dead band is 50% of the Pressure/Flow setpoint [ / ]. If the regulator is used to control a damper, choose a higher value to avoid execsive activity. Regulator - Minimum regulator output [ ] Use Regulator menu 4 to set the minimum regulator output. Minimum regulator output can be set between 0% and 50%. Regulator - Maximum regulator output [ ] Use Regulator menu 5 to set the maximum regulator output. Maximum regulator output can be set between 50% and 100%. Calibration menu When calibrating, make sure the VCH are in a pressure free environment. To obtain a pressure free enviroment remove the two air tubes on the VCH. For caution reasons, each calibration will only calibrate ±5 Pa. Calibration [ ] Use Calibration menu 1 to calibrate. Confirm by pressing [ ]. ] Factory reset [ Use Calibration menu 2 to set the VCH back to factory reset. Confirm by pressing [ ]. LED INDICATOR Front A LED on the frontside of the VCH indicates the operating status. A constant red lit means the operating range is not reached. Contrary a constant green lit means the operating range is reached. A flashing red lit means that an error is active. See Troubleshooting for more information. Inside (VCH-6201-DI only) A flashing yellow LED indicates communication on the Modbus port. TECHNICAL DATA Supply voltage VCH-6201-DI..............................24 VDC ±15% VCH-3202-DI..... 24 VAC/VDC ±15%, 50/60 Hz Power consumption....................................0.5 W Output.................................0-10 VDC, 2-10 VDC 0-20 mA, 4-20 mA Electrical connection............4 × screw terminals, max. 1.5 mm2 Measuring range, pressure ................. 0-2500 Pa Accuracy *............................ 0.5% * MV ± 2.5 Pa Maximum pressure.................................... 20 kPa Ambient air humidity........................ 10-95 %RH, non-condensing

Housing dimensions [h×w×d]....91 × 75 × 38 mm Cable dimension.................................. ø3-10 mm Pressure tubes................................. 2 × ø6,2 mm Maximum load 0 - 10 VDC....................................... > 2.5 kΩ 0 - 20 mA........................................